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You won't see many "My factory IMS bearing is doing fine" threads, so the IMS issue seems larger then it ever really was.
Here is an entry from the 986 wiki page:
"Early engines had a small number of failures, due to cracked or slipped cylinder liners, which were resolved by a minor redesign in 2000. Other failures have been reported, most notably involving the intermediate shaft (IMS) bearing, but affecting less than 5% of all cars.[citation needed]"
There is nothing to support the 5% claim, so take it how you will. From my research the one way to see if it's a developing issue in a car, you can look at the cam deviations using a durametric and see if one of them is moving up and down which 'might' indicate a failure in the works.
Lots of people have simply replaced them either for piece of mind, or as part of other maintenance like installing a rear main seal, or a new clutch.
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